2381

Physics Rotational Mechanics Level: High School

Rotational Equilibrium

The arm in the figure which is shown at “click here” weighs 42.6 N . The force of gravity acting on the arm acts through point A . Assume that L1 = 0.0730 m , L2 = 0.335 m and infinite = 10.4 degrees .

a) Determine the magnitude of the tension force F1 in the deltoid muscle .

b) Determine the magnitude of the tension force Fs of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown .

c) Determine the angle of tension force Fs relative to the x-axis .